Camera optical lens

ABSTRACT

Provided is a camera optical lens including, sequentially from an object side to an image side: a first lens having a negative refractive power; a second lens; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens; a sixth lens having a positive refractive power; and a seventh lens having a negative refractive power. At least one of the first to seventh lenses comprises a free-form surface. The camera optical lens satisfies following conditions: −5.00≤f1/f≤−1.00; and 1.50≤d1/d2≤7.00. The camera optical lens can achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses.

TECHNICAL FIELD

The present invention relates to the field of optical lens, and more particularly, to a camera optical lens suitable for handheld terminal devices, such as smart phones or digital cameras, and camera devices, such as monitors or PC lenses.

BACKGROUND

With the development of imaging lenses, requirements on imaging of the lenses have become increasingly higher. The features of “night scene photography” and “background blurring” of the lenses have also become important indicators for measuring the imaging standards of the lenses. At present, rotationally symmetric aspheric surfaces are commonly used. Such aspheric surfaces only have sufficient degrees of freedom in the meridian plane, and cannot correct off-axis aberrations effectively. In addition, the existing structures have insufficient refractive power distributions, lens spacings and lens shape settings, resulting in insufficient ultra-thin and wide-angle properties of the lenses. Moreover, a rotationally symmetric aspheric surface cannot correct aberrations effectively. A free-form surface is a non-rotationally symmetric surface type, which can better balance aberrations and improve imaging quality. The manufacture of free-form surfaces has gradually matured. As the requirements on the imaging of the lens increase, it is very important to add free-form surfaces when designing the lens, especially in the design of wide-angle and ultra-wide-angle lenses.

SUMMARY

In view of the problems, the present invention aims to provide a camera optical lens, which can achieve high optical performance while satisfying requirements for ultra-thin and wide-angle lenses.

In an embodiment, the present invention provides a camera optical lens. The camera optical lens includes, sequentially from an object side to an image side: a first lens having a negative refractive power; a second lens; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens; a sixth lens having a positive refractive power; and a seventh lens having a negative refractive power. At least one of the first to seventh lenses comprises a free-form surface. The camera optical lens satisfies following conditions: −5.00≤f1/f≤−1.00; and 1.50≤d1/d2≤7.00, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; d1 denotes an on-axis thickness of the first lens; and d2 denotes an on-axis distance from an image side surface of the first lens to an object side surface of the second lens.

As an improvement, the camera optical lens further satisfies a following condition: 0≤R3/R4≤2.00, where R3 denotes a curvature radius of the object side surface of the second lens; and R4 denotes a curvature radius of an image side surface of the second lens.

As an improvement, the camera optical lens further satisfies a following condition: −4.00≤f7/f≤−1.50, where f7 denotes a focal length of the seventh lens.

As an improvement, the camera optical lens further satisfies following conditions: −5.41≤(R1+R2)/(R1−R2)≤0.55; and 0.03≤d1/TTL≤0.18, where R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of the image side surface of the first lens; and TTL denotes a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: −12.01≤f2/f≤4.72; −4.80≤(R3+R4)/(R3−R4)≤5.83; and 0.03≤d3/TTL≤0.11, where f2 denotes a focal length of the second lens; R3 denotes a curvature radius of the object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: 0.63≤f3/f≤2.21; 0.07≤(R5+R6)/(R5-R6)≤0.24; and 0.06≤d5/TTL≤0.21, where f3 denotes a focal length of the third lens; R5 denotes a curvature radius of an object side surface of the third lens; R6 denotes a curvature radius of an image side surface of the third lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: −7.14≤f4/f≤−1.25; 0.29≤(R7+R8)/(R7−R8)≤2.28; and 0.02≤d7/TTL≤0.07, where f4 denotes a focal length of the fourth lens; R7 denotes a curvature radius of an object side surface of the fourth lens; R8 denotes a curvature radius of an image side surface of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: −216.57≤f5/f≤3.80; −21.08≤(R9+R10)/(R9−R10)≤2.81; and 0.05≤d9/TTL≤0.15, where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object side surface of the fifth lens; R10 denotes a curvature radius of an image side surface of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: 0.48≤f6/f≤2.47; 0.47≤(R11+R12)/(R11−R12)≤2.53; and 0.05≤d11/TTL≤0.17, where f6 denotes a focal length of the sixth lens; R11 denotes a curvature radius of an object side surface of the sixth lens; R12 denotes a curvature radius of an image side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: 0.96≤(R13+R14)/(R13-R14)≤5.19; and 0.03≤d13/TTL≤0.24, where R13 denotes a curvature radius of an object side surface of the seventh lens; R14 denotes a curvature radius of an image side surface of the seventh lens; d13 denotes an on-axis thickness of the seventh lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

The present invention has advantageous effects in that the camera optical lens according to the present invention has excellent optical performance, is ultra-thin, wide-angle and includes, among the first lens to the seventh lens, at least one lens that includes a free-form surface, which can effectively correct aberrations while further improving the performance of the optical system, making it especially suitable for high-pixel camera optical lens assembly of mobile phones and WEB camera optical lenses formed by camera elements such as CCD and CMOS.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present invention. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 1 of the present invention;

FIG. 2 illustrates a case where an RMS spot diameter of the camera optical lens shown in FIG. 1 is in a first quadrant.

FIG. 3 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 2 of the present invention;

FIG. 4 illustrates a case where an RMS spot diameter of the camera optical lens shown in FIG. 3 is in a first quadrant.

FIG. 5 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 3 of the present invention;

FIG. 6 illustrates a case where an RMS spot diameter of the camera optical lens shown in FIG. 5 is in a first quadrant.

FIG. 7 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 4 of the present invention; and

FIG. 8 illustrates a case where an RMS spot diameter of the camera optical lens shown in FIG. 7 is in a first quadrant.

DESCRIPTION OF EMBODIMENTS

The present invention will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present invention more apparent, the present invention is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1 , the present invention provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment 1 of the present invention. The camera optical lens 10 includes seven lenses. Specifically, the camera optical lens 10 includes, sequentially from an object side to an image side, a first lens L1, a second lens L2, an aperture S1, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as a glass filter (GF) can be arranged between the seventh lens L7 and an image plane Si.

In this embodiment, the first lens L1 is made of a plastic material, the second lens L2 is made of a plastic material, the third lens L3 is made of a plastic material, the fourth lens L4 is made of a plastic material, the fifth lens L5 is made of a plastic material, the sixth lens L6 is made of a plastic material, and the seventh lens L7 is made of a plastic material.

A focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens L1 is defined as f1. The camera optical lens 10 should satisfy a condition of −5.00≤f1/f≤−1.00, which specifies a ratio of the focal length of the first lens L1 to the focal length of the camera optical lens 10. This can effectively balance spherical aberrations and a field curvature of the system. As an example, −4.71≤f1/f≤−1.18.

An on-axis thickness of the first lens L1 is defined as d1, and an on-axis distance from an image side surface of the first lens L1 to an object side surface of the second lens L2 is defined as d2. The camera optical lens 10 should satisfy a condition of 1.50≤d1/d2≤7.00, which specifies a ratio of the thickness of the first lens to an air space between the first and second lenses. When the condition is satisfied, reduction of the total length can be facilitated, thereby achieving ultra-thin lenses. As an example, 1.51≤d1/d2≤6.84.

At least one of the first lens L1 to the seventh lens L7 includes a free-form surface. This can effectively correct aberrations while further improving the performance of the optical system.

A curvature radius of the object side surface of the second lens L2 is defined as R3, and a curvature radius of the image side surface of the second lens L2 is defined as R4. The camera optical lens 10 should satisfy a condition of 0≤R3/R4≤2.00, which specifies a shape of the second lens L2. When the condition is satisfied, the lens assembly and processing can be facilitated. As an example, 0.21≤R3/R4≤1.85.

The focal length of the camera optical lens 10 is f, and the focal length of the seventh lens L7 is P. The camera optical lens 10 further satisfies a condition of −4.00≤f7/f≤−1.50, which specifies a ratio of the focal length of the seventh lens to the focal length of the camera optical lens 10. The appropriate distribution of the refractive power leads to better imaging quality and a lower sensitivity. As an example, −3.78≤f7/f≤−1.56.

In this embodiment, the first lens L1 has a negative refractive power, and includes an object side surface being concave in a paraxial region and an image side surface being convex in the paraxial region.

A curvature radius of the object side surface of the first lens L1 is defined as R1, and a curvature radius of the image side surface of the first lens L1 is defined as R2. The camera optical lens 10 should satisfy a condition of −5.41≤(R1+R2)/(R1−R2)≤0.55. By reasonably controlling a shape of the first lens L1, the first lens L1 can effectively correct spherical aberrations of the system. As an example, −3.38≤(R1+R2)/(R1-R2)≤0.44.

An on-axis thickness of the first lens L1 is defined as d1, and a total optical length from the object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.03≤d1/TTL≤0.18. This can facilitate achieving ultra-thin lenses. As an example, 0.04≤d1/TTL≤0.14.

In an embodiment, the second lens L2 has a negative refractive power, and includes an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is f, and a focal length of the second lens L2 is f2. The camera optical lens 10 further satisfies a condition of −12.01≤f2/f≤4.72. By controlling the refractive power of the second lens L2 within the reasonable range, correction of aberrations of the optical system can be facilitated. As an example, −7.50≤f2/f≤3.78.

A curvature radius of the object side surface of the second lens L2 is defined as R3, and a curvature radius of the image side surface of the second lens L2 is defined as R4. The camera optical lens 10 should satisfy a condition of −4.80≤(R3+R4)/(R3−R4)≤5.83, which specifies a shape of the second lens L2. This can facilitate correction of an on-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, −3.00≤(R3+R4)/(R3−R4)≤4.66.

An on-axis thickness of the second lens L2 is defined as d3, and the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens 10 along the optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.03≤d3/TTL≤0.11. This can facilitate achieving ultra-thin lenses. As an example, 0.05≤d3/TTL≤0.09.

In an embodiment, the third lens L3 has a positive refractive power, and includes an object side surface being convex in the paraxial region and an image side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is f, and a focal length of the third lens L3 is f3. The camera optical lens 10 further satisfies a condition of 0.63≤f3/f≤2.21. The appropriate distribution of the refractive power leads to better imaging quality and a lower sensitivity. As an example, 1.00≤f3/f≤1.77.

A curvature radius of the object side surface of the third lens L3 is defined as R5, and a curvature radius of the image side surface of the third lens L3 is defined as R6. The camera optical lens 10 should satisfy a condition of 0.07≤(R5+R6)/(R5−R6)≤0.24. This specifies a shape of the third lens. When the condition is satisfied, the deflection of light passing through the lens can be alleviated, and aberrations can be effectively reduced. As an example, 0.11≤(R5+R6)/(R5−R6)≤0.19.

An on-axis thickness of the third lens L3 is defined as d5, and the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens 10 along the optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.06≤d5/TTL≤0.21. This can facilitate achieving ultra-thin lenses. As an example, 0.10≤d5/TTL≤0.17.

In an embodiment, the fourth lens L4 has a negative refractive power, includes an object side surface being is convex in a paraxial region and an image side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is f, and a focal length of the fourth lens L4 is f4. The camera optical lens 10 further satisfies a condition of −7.14≤f4/f≤−1.25, which specifies a ratio of the focal length of the fourth lens L4 to the focal length of the camera optical lens. This facilitates improving the performance of the optical system. As an example, −4.46≤f4/f≤−1.56.

A curvature radius of the object side surface of the fourth lens L4 is defined as R7, and a curvature radius of the image side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 should satisfy a condition of 0.29≤(R7+R8)/(R7−R8)≤2.28, which specifies a shape of the fourth lens L4. This can facilitate correction of an off-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, 0.47≤(R7+R8)/(R7−R8)≤1.82.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens 10 along the optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.02≤d7/TTL≤0.07. This can facilitate achieving ultra-thin lenses. As an example, 0.03≤d7/TTL≤0.06.

In an embodiment, the fifth lens L5 has a negative refractive power, and includes an object side surface being concave in a paraxial region and an image side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is f, and the focal length of the fifth lens L5 is f5. The camera optical lens 10 further satisfies a condition of −216.57≤f5/f≤3.80. This condition for the fifth lens L5 can effectively make a light angle of the camera optical lens 10 gentle and reduce the tolerance sensitivity. As an example, −135.36≤f5/f≤3.04.

A curvature radius of the object side surface of the fifth lens L5 is defined as R9, and a curvature radius of the image side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 should satisfy a condition of −21.08≤(R9+R10)/(R9−R10)≤2.81, which specifies a shape of the fifth lens L5. This can facilitate correction of an off-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, −13.18≤(R9+R10)/(R9−R10)≤2.25.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens 10 along the optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.05≤d9/TTL≤0.15. This can facilitate achieving ultra-thin lenses. As an example, 0.07≤d9/TTL≤0.12.

In an embodiment, the sixth lens L6 has a positive refractive power, and includes an object side surface being concave in a paraxial region and an image side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is f, and the focal length of the sixth lens L6 is f6. The camera optical lens 10 further satisfies a condition of 0.48≤f6/f≤2.47. The appropriate distribution of the refractive power leads to better imaging quality and a lower sensitivity. As an example, 0.76≤f6/f≤1.97.

A curvature radius of the object side surface of the sixth lens L6 is defined as R11, and a curvature radius of the image side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 should satisfy a condition of 0.47≤(R11+R12)/(R11−R12)≤2.53, which specifies a shape of the sixth lens L6. This can facilitate correction of an off-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, 0.75≤(R11+R12)/(R11−R12)≤2.03.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens 10 along the optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.05≤d11/TTL≤0.17. This can facilitate achieving ultra-thin lenses. As an example, 0.07≤d11/TTL≤0.13.

In an embodiment, the seventh lens L7 has a negative refractive power, and includes an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region.

A curvature radius of the object side surface of the seventh lens L7 is defined as R13, and a curvature radius of the image side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 further satisfies a condition of 0.96≤(R13+R14)/(R13−R14)≤5.19, which specifies a shape of the seventh lens L7. This can facilitate correction of an off-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, 1.53≤(R13+R14)/(R13−R14)≤4.15.

An on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens 10 along the optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.03≤d13/TTL≤0.24. This can facilitate achieving ultra-thin lenses. As an example, 0.05≤d13/TTL≤0.20.

In this embodiment, an F number of the camera optical lens 10 is smaller than or equal to 2.06. The camera optical lens 10 has a large aperture and better imaging performance. As an example, the F number of the camera optical lens 10 is smaller than or equal to 2.02.

In this embodiment, the total optical length TTL of the camera optical lens 10 is smaller than or equal to 6.71 mm, which is beneficial for achieving ultra-thin lenses. As an example, the total optical length TTL of the camera optical lens 10 is smaller than or equal to 6.40 mm.

When the above conditions are satisfied, the camera optical lens 10 will have high optical imaging performance, and at the same time, with the free-form surface, achieve matching between a designed image side surface region and an actually used region, which can improve image quality of the effective region to the maximum extent. With these characteristics, the camera optical lens 10 is especially suitable for high-pixel camera optical lens assembly of mobile phones and WEB camera optical lenses formed by imaging elements such as CCD and CMOS.

In the following, examples will be used to describe the camera optical lens 10 of the present invention. The symbols recorded in each example will be described as follows. The focal length, on-axis distance, and curvature radius are all in units of mm.

TTL: Optical length (the total optical length from the object side surface of the first lens L1 to the image plane Si of the camera optical lens along the optic axis) in mm.

F number (FNO): a ratio of an effective focal length of the camera optical lens to an entrance pupil diameter (ENPD) of the camera optical lens.

Table 1 and Table 2 show design data of the camera optical lens 10 according to Embodiment 1 of the present invention, in which the object side surface and the image side surface of the sixth lens L6 are each a free-form surface.

TABLE 1 R d nd νd S1 ∞ d0= −1.848 R1 −2.071 d1= 0.712 nd1 1.5444 ν1 56.43 R2 −4.499 d2= 0.139 R3 4.579 d3= 0.433 nd2 1.6800 ν2 18.40 R4 2.705 d4= 0.516 R5 2.758 d5= 0.797 nd3 1.5444 ν3 56.43 R6 −2.075 d6= 0.231 R7 16.567 d7= 0.240 nd4 1.6800 ν4 18.40 R8 3.418 d8= 0.087 R9 −17.075 d9= 0.594 nd5 1.5444 ν5 56.43 R10 −20.654 d10= 0.112 R11 −299.953 d11= 0.569 nd6 1.5444 ν6 56.43 R12 −0.932 d12= 0.040 R13 1.136 d13= 0.375 nd7 1.6153 ν7 26.00 R14 0.605 d14= 0.600 R15 ∞ d15= 0.210 ndg 1.5168 νg 64.17 R16 ∞ d16= 0.444

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: central curvature radius of an optical surface;

R1: curvature radius of the object side surface of the first lens L1;

R2: curvature radius of the image side surface of the first lens L1;

R3: curvature radius of the object side surface of the second lens L2;

R4: curvature radius of the image side surface of the second lens L2;

R5: curvature radius of the object side surface of the third lens L3;

R6: curvature radius of the image side surface of the third lens L3;

R7: curvature radius of the object side surface of the fourth lens L4;

R8: curvature radius of the image side surface of the fourth lens L4;

R9: curvature radius of the object side surface of the fifth lens L5;

R10: curvature radius of the image side surface of the fifth lens L5;

R11: curvature radius of the object side surface of the sixth lens L6;

R12: curvature radius of the image side surface of the sixth lens L6;

R13: curvature radius of the object side surface of the seventh lens L7;

R14: curvature radius of the image side surface of the seventh lens L7;

R15: curvature radius of an object side surface of the optical filter GF;

R16: curvature radius of an image side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image side surface of the seventh lens L7 to the object side surface of the optical filter GF;

d15: on-axis thickness of the optical filter GF;

d16: on-axis distance from the image side surface of the optical filter GF to the image plane;

nd: refractive index of d line;

nd1: refractive index of d line of the first lens L1;

nd2: refractive index of d line of the second lens L2;

nd3: refractive index of d line of the third lens L3;

nd4: refractive index of d line of the fourth lens L4;

nd5: refractive index of d line of the fifth lens L5;

nd6: refractive index of d line of the sixth lens L6;

nd7: refractive index of d line of the seventh lens L7;

ndg: refractive index of d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of respective lens in the camera optical lens 10 according to Embodiment 1 of the present invention.

TABLE 2 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 R1 −1.8339E+01 9.5091E−02 −5.7882E−02 2.5208E−02 −7.4051E−03 1.4476E−03 R2  2.6255E−01 8.9631E−01 −1.9363E+00 4.4128E+00 −8.1217E+00 1.0447E+01 R3  9.9930E+00 6.0024E−01 −1.8856E+00 6.0340E+00 −1.4769E+01 2.5073E+01 R4 −1.4620E+00 2.1430E−01 −1.3374E−01 3.5196E−01  1.0877E+00 −5.7704E+00  R5 −5.4802E+00 6.3985E−02 −3.2584E−03 −5.8965E−02   0.0000E+00 0.0000E+00 R6  2.7697E+00 −9.0993E−02   1.8720E−01 −2.5171E−01   1.6500E−01 −4.4213E−02  R7  1.0000E+01 −4.5683E−01   6.2283E−01 −1.5486E+00   4.1735E+00 −9.6470E+00  R8 −9.9955E+00 −2.8523E−01   1.7508E−01 5.5108E−01 −1.7117E+00 2.2179E+00 R9  1.0000E+01 2.8129E−02 −4.9701E−01 1.8527E+00 −3.3257E+00 3.1967E+00 R10 −4.6489E+00 8.0738E−02 −7.3952E−01 1.4500E+00 −2.1646E+00 2.2893E+00 R13 −1.9726E+00 −3.8614E−01   2.8044E−01 −1.4958E−01   5.1453E−02 −6.2106E−03  R14 −3.2191E+00 −1.6994E−01   1.1434E−01 −5.9479E−02   2.1946E−02 −5.4045E−03  Conic coefficient Aspherical surface coefficients k A14 A16 A18 A20 R1 −1.8339E+01 −1.7891E−04 1.2545E−05 −3.7738E−07 0.0000E+00 R2  2.6255E−01 −8.7993E+00 4.5953E+00 −1.3389E+00 1.6482E−01 R3  9.9930E+00 −2.7941E+01 1.9364E+01 −7.5085E+00 1.2323E+00 R4 −1.4620E+00  1.1047E+01 −9.3633E+00   2.8691E+00 0.0000E+00 R5 −5.4802E+00  0.0000E+00 0.0000E+00  0.0000E+00 0.0000E+00 R6  2.7697E+00  0.0000E+00 0.0000E+00  0.0000E+00 0.0000E+00 R7  1.0000E+01  1.5679E+01 −1.6572E+01   1.0071E+01 −2.6024E+00  R8 −9.9955E+00 −1.5460E+00 5.6919E−01 −8.6946E−02 0.0000E+00 R9  1.0000E+01 −1.5127E+00 1.5720E−01  1.3470E−01 −3.9295E−02  R10 −4.6489E+00 −1.5772E+00 6.5722E−01 −1.4506E−01 1.2405E−02 R13 −1.9726E+00 −2.6622E−03 1.1972E−03 −1.7914E−04 9.4688E−06 R14 −3.2191E+00  8.2152E−04 −6.7804E−05   2.0477E−06 3.2406E−08 z=(cr ²)/[1+{1−(k+1)(c ² r ²)}^(1/2)]+A4r ⁴ +A6r ⁶ +A8r ⁸ +A10r ¹⁰ +A12r ¹² +A14r ¹⁴ +A16r ¹⁶ +A18r ¹⁸ +A20r ²⁰  (1),

where k is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients, c denotes a central curvature radius of an optical surface, r denotes a normal distance between a point on an aspheric surface curve to the optic axis, and z denotes a depth of the aspheric surface (a normal distance between a point on the aspherical surface, having a distance of r from the optic axis, and a surface tangent to a vertex of the aspherical surface on the optic axis).

In the present embodiment, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above condition (1). However, the present invention is not limited to the aspherical polynomial form shown in the condition (1).

Table 3 shows data of free-form surfaces of the camera optical lens 10 according to Embodiment 1 of the present invention.

TABLE 3 Free-form surface coefficients k X⁴Y⁰ X²Y² X⁰Y⁴ X⁶Y⁰ X⁴Y² X²Y⁴ X⁰Y⁶ R11 1.0000E+01 3.2484E−01 6.4831E−01 3.2374E−01 −9.2282E−01 −2.7666E+00 −2.7654E+00 −9.2136E−01 R12 −7.5439E−01  4.9995E−01 9.9866E−01 4.9895E−01 −7.4701E−01 −2.2398E+00 −2.2395E+00 −7.4614E−01 X⁴Y⁶ X²Y⁸ X⁰Y¹⁰ X¹²Y⁰ X¹⁰Y² X⁸Y⁴ X⁶Y⁶ X⁴Y⁸ R11 −2.0725E+01  −1.0364E+01  −2.0733E+00  1.7603E+00  1.0562E+01  2.6407E+01  3.5210E+01  2.6409E+01 R12 −1.4527E+01  −7.2656E+00  −1.4532E+00  1.0095E+00  6.0579E+00  1.5144E+01  2.0192E+01  1.5146E+01 X²Y¹² X⁰Y¹⁴ X¹⁶Y⁰ X¹⁴Y² X¹²Y⁴ X¹⁰Y⁶ X⁸Y⁸ X⁶Y¹⁰ R11 −6.9058E+00  −9.8634E−01  3.4402E−01 2.7517E+00  9.6319E+00  1.9263E+01  2.4078E+01  1.9261E+01 R12 −3.2078E+00  −4.5815E−01  1.3249E−01 1.0596E+00  3.7090E+00  7.4182E+00  9.2721E+00  7.4178E+00 X⁸Y¹⁰ X⁶Y¹² X⁴Y¹⁴ X²Y¹⁶ X⁰Y¹⁸ X²⁰Y⁰ X¹⁸Y² X¹⁶Y⁴ R11 −8.4018E+00  −5.6032E+00  −2.3990E+00  −5.9957E−01  −6.6855E−02  5.4366E−03  5.4536E−02  2.4489E−01 R12 −2.7691E+00  −1.8455E+00  −7.9161E−01  −1.9758E−01  −2.1981E−02  1.5760E−03  1.5832E−02  7.1110E−02 X⁸Y⁰ X⁶Y² X⁴Y⁴ X²Y⁶ X⁰Y⁸ X¹⁰Y⁰ X⁸Y² X⁶Y⁴ R11 1.6504E+00 6.5975E+00 9.8993E+00 6.5961E+00  1.6492E+00 −2.0731E+00 −1.0361E+01 −2.0734E+01 R12 1.3198E+00 5.2776E+00 7.9167E+00 5.2778E+00  1.3193E+00 −1.4530E+00 −7.2641E+00 −1.4532E+01 X²Y¹⁰ X⁰Y¹² X¹⁴Y⁰ X¹²Y² X¹⁰Y⁴ X⁸Y⁶ X⁶Y⁸ X⁴Y¹⁰ R11 1.0563E+01 1.7608E+00 −9.8642E−01  −6.9061E+00  −2.0716E+01 −3.4528E+01 −3.4524E+01 −2.0717E+01 R12 6.0571E+00 1.0098E+00 −4.5827E−01  −3.2082E+00  −9.6237E+00 −1.6039E+01 −1.6040E+01 −9.6249E+00 X⁴Y¹² X²Y¹⁴ X⁰Y¹⁶ X¹⁸Y⁰ X¹⁶Y² X¹⁴Y⁴ X¹²Y⁶ X¹⁰Y⁸ R11 9.6282E+00 2.7520E+00 3.4401E−01 −6.6671E−02  −5.9998E−01 −2.4002E+00 −5.5997E+00 −8.3998E+00 R12 3.7079E+00 1.0602E+00 1.3234E−01 −2.1971E−02  −1.9779E−01 −7.9110E−01 −1.8461E+00 −2.7696E+00 X¹⁴Y⁶ X¹²Y⁸ X¹⁰Y¹⁰ X⁸Y¹² X⁶Y¹⁴ X⁴Y¹⁶ X²Y¹⁸ X⁰Y²⁰ R11 6.5366E−01 1.1424E+00 1.3727E+00 1.1448E+00  6.5604E−01  2.4450E−01  5.4372E−02  5.4926E−03 R12 1.8962E−01 3.3229E−01 3.9832E−01 3.3201E−01  1.8990E−01  7.1342E−02  1.5657E−02  1.5897E−03

$\begin{matrix} {{Z = {\frac{cr^{2}}{1 + \sqrt{1 - {\left( {1 + k} \right)c^{2}r^{2}}}} + {\sum\limits_{i = 1}^{N}{B_{i}{E_{i}\left( {x,y} \right)}}}}},} & (2) \end{matrix}$

where k is a conic coefficient, Bi denotes aspheric surface coefficients, c denotes a central curvature radius of an optical surface, r denotes a normal distance between a point on an aspheric surface curve to the optic axis, x denotes a x direction component of r, y denotes a y direction component of r, and z denotes a depth of the aspheric surface (a normal distance between a point on the aspherical surface, having a distance of r from the optic axis, and a surface tangent to a vertex of the aspherical surface on the optic axis).

For sake of explanation, each free-form surface adopts an extended polynomial form indicated in the above equation (2), however, the present invention is not limited thereto.

FIG. 2 illustrates a case where an RMS spot diameter of the camera optical lens 10 according to Embodiment 1 is in a first quadrant. It can be seen from FIG. 2 that the camera optical lens 10 according to Embodiment 1 can achieve excellent imaging quality.

Table 13 below lists various values of Embodiments 1, 2, 3 and 4 and values corresponding to parameters which are specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies the respective conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 0.908 mm. A full-field image height of the camera optical lens (along a diagonal direction) is 6.000 mm, an image height along the x direction of the camera optical lens is 4.800 mm, and an image height along the y direction of the camera optical lens is 3.600 mm. In such rectangular range, the best imaging effect can be achieved. A FOV (field of view) along a diagonal direction is 120.00°, a FOV along the x direction is 107.38°, and a FOV along the y direction is 90.58°. Thus, the camera optical lens 10 can satisfy design requirements for ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment, and only differences from Embodiment 1 will be described below.

FIG. 3 is a schematic diagram of a structure of a camera optical lens 20 in accordance with Embodiment 2 of the present invention. In this embodiment, the object side surface of the sixth lens L6 is convex in the paraxial region.

Table 4 and Table 5 show design data of the camera optical lens 20 according to Embodiment 2 of the present invention, in which the object side surface and the image side surface of the first lens L1 are each a free-form surface.

TABLE 4 R d nd νd S1 ∞ d0= −1.723 R1 −2.108 d1= 0.667 nd1 1.5444 ν1 56.43 R2 −5.213 d2= 0.100 R3 4.673 d3= 0.391 nd2 1.6800 ν2 18.40 R4 2.752 d4= 0.500 R5 2.687 d5= 0.836 nd3 1.5444 ν3 56.43 R6 −1.957 d6= 0.221 R7 18.870 d7= 0.240 nd4 1.6800 ν4 18.40 R8 3.479 d8= 0.090 R9 −16.790 d9= 0.593 nd5 1.5444 ν5 56.43 R10 −358.255 d10= 0.109 R11 29.941 d11= 0.581 nd6 1.5444 ν6 56.43 R12 −0.947 d12= 0.040 R13 1.070 d13= 0.359 nd7 1.6153 ν7 26.00 R14 0.590 d14= 0.600 R15 ∞ d15= 0.210 ndg 1.5168 νg 64.17 R16 ∞ d16= 0.450

Table 5 shows aspheric surface data of respective lenses in the camera optical lens 20 according to Embodiment 2 of the present invention.

TABLE 5 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 R3  9.8635E+00 5.9865E−01 −1.8931E+00 6.2270E+00 −1.5623E+01 2.7229E+01 R4 −4.1964E+00 1.9639E−01 −1.8751E−01 1.9781E+00 −9.3538E+00 2.9819E+01 R5 −7.6280E+00 7.8024E−02  3.2041E−02 −3.4924E−01   8.0611E−01 −9.6759E−01  R6  2.7515E+00 −7.0488E−02   4.5874E−02 7.0485E−01 −3.7955E+00 1.1268E+01 R7 −1.0000E+01 −4.2165E−01   4.4855E−01 −7.8105E−01   1.2602E+00 −1.7614E+00  R8 −9.9910E+00 −2.4634E−01   1.1763E−01 5.5700E−01 −1.7770E+00 2.7176E+00 R9  9.7036E+00 3.4352E−02 −4.5569E−01 1.6709E+00 −3.2105E+00 3.6107E+00 R10  1.0000E+01 7.9268E−02 −7.3321E−01 1.4573E+00 −2.4018E+00 2.8445E+00 R11  1.0000E+01 3.3910E−01 −9.2426E−01 1.6135E+00 −2.0625E+00 1.7801E+00 R12 −7.5826E−01 5.1229E−01 −8.3708E−01 1.5462E+00 −1.7872E+00 1.2973E+00 R13 −2.0984E+00 −3.5447E−01   1.3258E−01 6.5472E−02 −1.0564E−01 6.0317E−02 R14 −2.8896E+00 −2.1885E−01   1.4980E−01 −6.7499E−02   1.9341E−02 −3.2558E−03  Conic coefficient Aspherical surface coefficients k A14 A16 A18 A20 R3  9.8635E+00 −3.1189E+01 2.2243E+01 −8.9033E+00 1.5161E+00 R4 −4.1964E+00 −6.0909E+01 7.6703E+01 −5.3726E+01 1.5865E+01 R5 −7.6280E+00  2.6585E−01 0.0000E+00  0.0000E+00 0.0000E+00 R6  2.7515E+00 −2.1393E+01 2.5094E+01 −1.6292E+01 4.4123E+00 R7 −1.0000E+01  1.9835E+00 −2.2561E+00   1.8678E+00 −6.4259E−01  R8 −9.9910E+00 −2.4792E+00 1.3748E+00 −4.3046E−01 5.8799E−02 R9  9.7036E+00 −2.3663E+00 8.4024E−01 −1.2561E−01 0.0000E+00 R10  1.0000E+01 −2.1737E+00 1.0090E+00 −2.5610E−01 2.7068E−02 R11  1.0000E+01 −9.9975E−01 3.4587E−01 −6.6214E−02 5.3370E−03 R12 −7.5826E−01 −6.0634E−01 1.7775E−01 −2.9610E−02 2.1285E−03 R13 −2.0984E+00 −1.9601E−02 3.7454E−03 −3.8754E−04 1.6608E−05 R14 −2.8896E+00  2.2017E−04 1.9906E−05 −4.6271E−06 2.4259E−07

Table 6 shows data of free-form surfaces of the camera optical lens 20 according to Embodiment 2 of the present invention.

TABLE 6 Free-form surface coefficients k X⁴Y⁰ X²Y² X⁰Y⁴ X⁶Y⁰ X⁴Y² X²Y⁴ X⁰Y⁶ R1 −2.0000E+01 1.0069E−01 2.0201E−01 1.0096E−01 −6.0143E−02 −1.8092E−01 −1.8120E−01 −6.0501E−02 R2 −4.0592E+00 9.4790E−01 1.8988E+00 9.4907E−01 −2.1441E+00 −6.4458E+00 −6.4372E+00 −2.1502E+00 X⁴Y⁶ X²Y⁸ X⁰Y¹⁰ X¹²Y⁰ X¹⁰Y² X⁸Y⁴ X⁶Y⁶ X⁴Y⁸ R1 −7.9233E−02 −3.9628E−02  −7.9194E−03  1.5698E−03  9.4141E−03  2.3531E−02  3.1362E−02  2.3551E−02 R2 −1.0264E+02 −5.1326E+01  −1.0268E+01  1.3942E+01  8.3666E+01  2.0911E+02  2.7893E+02  2.0921E+02 X²Y¹² X⁰Y¹⁴ X¹⁶Y⁰ X¹⁴Y² X¹²Y⁴ X¹⁰Y⁶ X⁸Y⁸ X⁶Y¹⁰ R1 −1.3666E−03 −1.9575E−04  1.3726E−05 1.1007E−04  3.8600E−04  7.7308E−04  9.6366E−04  7.7010E−04 R2 −8.6251E+01 −1.2315E+01  6.6894E+00 5.3505E+01  1.8726E+02  3.7459E+02  4.6800E+02  3.7452E+02 X⁸Y¹⁰ X⁶Y¹² X⁴Y¹⁴ X²Y¹⁶ X⁰Y¹⁸ X²⁰Y⁰ X¹⁸Y² X¹⁶Y⁴ R1 −5.0448E−05 −3.3805E−05  −1.7139E−05  −4.2880E−06  −5.3062E−07  0.0000E+00  0.0000E+00  0.0000E+00 R2 −2.5204E+02 −1.6800E+02  −7.1699E+01  −1.8019E+01  −2.0031E+00  2.4784E−01  2.4761E+00  1.1150E+01 X⁸Y⁰ X⁶Y² X⁴Y⁴ X²Y⁶ X⁰Y⁸ X¹⁰Y⁰ X⁸Y² X⁶Y⁴ R1  2.6516E−02 1.0619E−01 1.5933E−01 1.0659E−01  2.6662E−02 −7.9141E−03 −3.9575E−02 −7.9076E−02 R2  5.2501E+00 2.1034E+01 3.1522E+01 2.1006E+01  5.2625E+00 −1.0260E+01 −5.1340E+01 −1.0266E+02 X²Y¹⁰ X⁰Y¹² X¹⁴Y⁰ X¹²Y² X¹⁰Y⁴ X⁸Y⁶ X⁶Y⁸ X⁴Y¹⁰ R1  9.3533E−03 1.5635E−03 −1.9581E−04  −1.3704E−03  −4.1169E−03 −6.8581E−03 −6.8544E−03 −4.1044E−03 R2  8.3700E+01 1.3934E+01 −1.2322E+01  −8.6249E+01  −2.5864E+02 −4.3126E+02 −4.3115E+02 −2.5888E+02 X⁴Y¹² X²Y¹⁴ X⁰Y¹⁶ X¹⁸Y⁰ X¹⁶Y² X¹⁴Y⁴ X¹²Y⁶ X¹⁰Y⁸ R1  3.9020E−04 1.1650E−04 1.4205E−05 −4.0206E−07  −3.6535E−06 −1.4708E−05 −3.3805E−05 −5.2040E−05 R2  1.8723E+02 5.3473E+01 6.6976E+00 −1.9994E+00  −1.7985E+01 −7.1984E+01 −1.6810E+02 −2.5174E+02 X¹⁴Y⁶ X¹²Y⁸ X¹⁰Y¹⁰ X⁸Y¹² X⁶Y¹⁴ X⁴Y¹⁶ X²Y¹⁸ X⁰Y²⁰ R1  0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00 R2  2.9824E+01 5.2067E+01 6.2536E+01 5.2216E+01  2.9796E+01  1.1016E+01  2.5174E+00  2.4528E−01

FIG. 4 illustrates a case where an RMS spot diameter of the camera optical lens 20 according to Embodiment 2 is in a first quadrant. It can be seen from FIG. 4 that the camera optical lens 20 according to Embodiment 2 can achieve excellent imaging quality.

As shown in Table 13, Embodiment 2 satisfies the respective conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 0.908 mm. A full-field image height of the camera optical lens (along a diagonal direction) is 6.000 mm, an image height along the x direction of the camera optical lens is 4.800 mm, and an image height along the y direction of the camera optical lens is 3.600 mm. In such rectangular range, the best imaging effect can be achieved. A FOV (field of view) along a diagonal direction is 120.00°, a FOV along the x direction is 107.60°, and a FOV along the y direction is 90.91°. Thus, the camera optical lens 20 can satisfy design requirements for ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences from Embodiment 1 will be described below.

FIG. 5 is a schematic diagram of a structure of a camera optical lens 30 in accordance with Embodiment 3 of the present invention. In this embodiment, the second lens L2 has a positive refractive power, the fifth lens L5 has a positive refractive power, the image side surface of the first lens L1 is concave in the paraxial region, and the object side surface of fourth lens L4 is concave in the paraxial region.

Table 7 and Table 8 show design data of the camera optical lens 30 according to Embodiment 3 of the present invention, in which the object side surface and the image side surface of the seventh lens L7 are each a free-form surface.

TABLE 7 R d nd νd S1 ∞ d0= −1.041 R1 −3.511 d1= 0.257 nd1 1.5444 ν1 55.82 R2 1.621 d2= 0.169 R3 1.638 d3= 0.355 nd2 1.6400 ν2 23.54 R4 3.979 d4= 0.317 R5 2.272 d5= 0.603 nd3 1.5450 ν3 55.81 R6 −1.737 d6= 0.183 R7 −8.965 d7= 0.244 nd4 1.6613 ν4 20.37 R8 2.325 d8= 0.054 R9 −4.323 d9= 0.456 nd5 1.5450 ν5 55.81 R10 −1.312 d10= 0.054 R11 −3.618 d11= 0.547 nd6 1.5450 ν6 55.81 R12 −0.926 d12= 0.048 R13 2.401 d13= 0.808 nd7 1.5444 ν7 55.82 R14 1.078 d14= 0.333 R15 ∞ d15= 0.231 ndg 1.5168 νg 64.17 R16 ∞ d16= 0.296

Table 8 shows aspheric surface data of respective lenses in the camera optical lens 30 according to Embodiment 3 of the present invention.

TABLE 8 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 R1 −2.0143E+02   2.5445E−01 −3.0287E−01   2.4610E−01 −1.3966E−01   5.2075E−02 R2 5.8525E−01  5.4492E−01 −6.9429E−01   1.2637E−01 8.3418E−01 −1.8058E+00 R3 1.0300E+00 −2.5963E−02 1.2355E−01  1.0934E−01 −9.1176E−02  −7.6508E−02 R4 2.4910E+01  1.3624E−02 1.1026E+00 −2.2645E+00 2.5769E+00  7.6302E+00 R5 3.0564E+00  7.7243E−02 −1.4248E−01  −1.4580E−02 4.4274E−01  2.2558E−01 R6 2.8517E+00 −2.6573E−01 6.9194E−02 −4.4218E−02 2.0926E−01  5.5716E−01 R7 1.0655E+02 −1.2707E+00 2.1502E+00 −1.0192E+01 4.6290E+01 −1.4815E+02 R8 −3.7218E+01  −7.1263E−01 1.9815E+00 −6.3346E+00 1.3932E+01 −1.9882E+01 R9 −9.2357E+02  −2.5835E−01 1.5940E+00 −5.9499E+00 1.3861E+01 −2.0565E+01 R10 −8.6350E+00  −9.5549E−02 3.7003E−02  6.0192E−02 1.8562E−02 −1.7049E−02 R11 4.4499E+00  4.4622E−02 −1.5972E−02  −7.4345E−03 1.8547E−02  1.2676E−02 R12 −6.3306E−01  −1.0692E−01 9.4655E−01 −2.0008E+00 3.0980E+00 −3.2463E+00 Conic coefficient Aspherical surface coefficients k A14 A16 A18 A20 R1 −2.0143E+02  −1.1141E−02   9.9070E−04 −1.7089E−05   2.6946E−06 R2 5.8525E−01 1.2584E+00 −2.6580E−01 1.9701E−02 −1.0919E−02 R3 1.0300E+00 7.4597E−02  1.4444E−01 −9.1964E−02  −6.2564E−01 R4 2.4910E+01 −3.1653E+00  −2.5395E+01 −3.0986E+01   1.3415E+02 R5 3.0564E+00 −3.5852E+00   2.6496E+00 2.5901E+01 −1.6966E+01 R6 2.8517E+00 8.4394E−01 −7.9187E−01 −6.1848E+00   1.1558E+01 R7 1.0655E+02 3.1844E+02 −4.0344E+02 2.5880E+02 −5.8807E+01 R8 −3.7218E+01  1.9817E+01 −1.3545E+01 5.5173E+00 −9.1974E−01 R9 −9.2357E+02  1.9905E+01 −1.2389E+01 4.4779E+00 −6.9986E−01 R10 −8.6350E+00  −2.3584E−02  −1.4671E−02 −1.1317E−03   1.1544E−02 R11 4.4499E+00 −9.9850E−03  −8.6241E−03 2.9676E−03 −9.5487E−05 R12 −6.3306E−01  2.2396E+00 −9.6248E−01 2.3072E−01 −2.3344E−02

Table 9 shows data of free-form surfaces of the camera optical lens 30 according to Embodiment 3 of the present invention.

TABLE 9 Free-form surface coefficients k X⁴Y⁰ X²Y² X⁰Y⁴ X⁶Y⁰ X⁴Y² X²Y⁴ X⁰Y⁶ R13 −3.9316E+03 −2.6201E−01 −5.1399E−01 −2.5948E−01  3.4503E−01 1.0324E+00 1.0262E+00 3.4285E−01 R14 −4.7946E+00 −2.7928E−01 −5.4913E−01 −2.7319E−01  2.3610E−01 7.0933E−01 7.1106E−01 2.3668E−01 X⁴Y⁶ X²Y⁸ X⁰Y¹⁰ X¹²Y⁰ X¹⁰Y² X⁸Y⁴ X⁶Y⁶ X⁴Y⁸ R13 −3.2756E+00 −1.6371E+00 −3.2713E−01  7.2227E−01  4.3324E+00 1.0833E+01 1.4445E+01 1.0836E+01 R14  9.5457E−01  4.7749E−01  9.5425E−02 −3.5185E−02 −2.1111E−01 −5.2779E−01  −7.0371E−01  −5.2776E−01  X²Y¹² X⁰Y¹⁴ X¹⁶Y⁰ X¹⁴Y² X¹²Y⁴ X¹⁰Y⁶ X⁸Y⁸ X⁶Y¹⁰ R13 −4.7320E+00 −6.7642E−01  3.4678E−01  2.7740E+00  9.7103E+00 1.9421E+01 2.4276E+01 1.9421E+01 R14  6.0622E−02  8.6556E−03 −1.3549E−03 −1.0839E−02 −3.7936E−02 −7.5872E−02  −9.4841E−02  −7.5873E−02  X⁸Y¹⁰ X⁶Y¹² X⁴Y¹⁴ X²Y¹⁶ X⁰Y¹⁸ X²⁰Y⁰ X¹⁸Y² X¹⁶Y⁴ R13 −1.1668E+01 −7.7764E+00 −3.3333E+00 −8.3334E−01 −9.2586E−02 9.9921E−03 1.0004E−01 4.5049E−01 R14  1.5250E−02  1.0165E−02  4.3543E−03  1.0915E−03  1.2105E−04 −4.6810E−06  −4.6866E−05  −2.1030E−04  X⁸Y⁰ X⁶Y² X⁴Y⁴ X²Y⁶ X⁰Y⁸ X¹⁰Y⁰ X⁸Y² X⁶Y⁴ R13 −1.8057E−01 −7.2371E−01 −1.0844E+00 −7.2427E−01 −1.8087E−01 −3.2768E−01  −1.6402E+00  −3.2784E+00  R14 −1.7633E−01 −7.0602E−01 −1.0589E+00 −7.0544E−01 −1.7656E−01 9.5490E−02 4.7728E−01 9.5452E−01 X²Y¹⁰ X⁰Y¹² X¹⁴Y⁰ X¹²Y² X¹⁰Y⁴ X⁸Y⁶ X⁶Y⁸ X⁴Y¹⁰ R13  4.3378E+00  7.2233E−01 −6.7650E−01 −4.7361E+00 −1.4207E+01 −2.3677E+01  −2.3677E+01  −1.4204E+01  R14 −2.1102E−01 −3.5199E−02  8.6564E−03  6.0598E−02  1.8179E−01 3.0299E−01 3.0299E−01 1.8180E−01 X⁴Y¹² X²Y¹⁴ X⁰Y¹⁶ X¹⁸Y⁰ X¹⁶Y² X¹⁴Y⁴ X¹²Y⁶ X¹⁰Y⁸ R13  9.7119E+00  2.7759E+00  3.4678E−01 −9.2589E−02 −8.3329E−01 −3.3324E+00  −7.7755E+00  −1.1664E+01  R14 −3.7942E−02 −1.0835E−02 −1.3550E−03  1.2103E−04  1.0891E−03 4.3577E−03 1.0169E−02 1.5251E−02 X¹⁴Y⁶ X¹²Y⁸ X¹⁰Y¹⁰ X⁸Y¹² X⁶Y¹⁴ X⁴Y¹⁶ X²Y¹⁸ X⁰Y²⁰ R13  1.2012E+00  2.1011E+00  2.5195E+00  2.0986E+00  1.1998E+00 4.4748E−01 9.8137E−02 9.9652E−03 R14 −5.6027E−04 −9.8082E−04 −1.1778E−03 −9.8262E−04 −5.6236E−04 −2.1115E−04  −4.2940E−05  −4.6192E−06 

FIG. 6 illustrates a case where an RMS spot diameter of the camera optical lens 30 according to Embodiment 3 is in a first quadrant. It can be seen from FIG. 6 that the camera optical lens 30 according to Embodiment 3 can achieve excellent imaging quality.

Table 13 below lists values corresponding to respective conditions in the present embodiment. The camera optical lens according to Embodiment 3 satisfies the respective conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 0.664 mm. A full-field image height of the camera optical lens (along a diagonal direction) is 6.000 mm, an image height along the x direction of the camera optical lens is 4.800 mm, and an image height along the y direction of the camera optical lens is 3.600 mm. In such rectangular range, the best imaging effect can be achieved. A FOV (field of view) along a diagonal direction is 116.68°, a FOV along the x direction is 106.50°, and a FOV along the y direction is 94.43°. Thus, the camera optical lens 30 can satisfy design requirements for ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 4

Embodiment 4 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences from Embodiment 1 will be described below.

FIG. 7 is a schematic diagram of a structure of a camera optical lens 40 in accordance with Embodiment 4 of the present invention. In this embodiment, the second lens L2 has a positive refractive power, the fifth lens L5 has a positive refractive power, the image side surface of the first lens L1 is concave in the paraxial region, and the object side surface of fourth lens L4 is concave in the paraxial region.

Table 10 and Table 11 show design data of the camera optical lens 40 according to Embodiment 4 of the present invention, in which the object side surface and the image side surface of the second lens L2 are each a free-form surface.

TABLE 10 R d nd νd S1 ∞ d0= −0.949 R1 −3.186 d1= 0.240 nd1 1.5444 ν1 55.82 R2 1.475 d2= 0.150 R3 1.494 d3= 0.323 nd2 1.6400 ν2 23.54 R4 3.651 d4= 0.288 R5 2.068 d5= 0.549 nd3 1.5450 ν3 55.81 R6 −1.578 d6= 0.166 R7 −8.148 d7= 0.222 nd4 1.6613 ν4 20.37 R8 2.128 d8= 0.051 R9 −4.171 d9= 0.417 nd5 1.5450 ν5 55.81 R10 −1.241 d10= 0.050 R11 −3.286 d11= 0.501 nd6 1.5450 ν6 55.81 R12 −0.842 d12= 0.049 R13 3.015 d13= 0.735 nd7 1.5444 ν7 55.82 R14 0.946 d14= 0.303 R15 ∞ d15= 0.210 ndg 1.5168 νg 64.17 R16 ∞ d16= 0.269

Table 11 shows aspheric surface data of respective lenses in the camera optical lens 40 according to Embodiment 4 of the present invention.

TABLE 11 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 R1 −2.0279E+02  3.3868E−01 −4.8766E−01   4.7969E−01 −3.2925E−01   1.4862E−01 R2  5.8971E−01  7.2530E−01 −1.1181E+00   2.4629E−01 1.9670E+00 −5.1522E+00 R5  3.0510E+00  1.0294E−01 −2.2870E−01  −2.7078E−02 1.0358E+00  6.3620E−01 R6  2.8717E+00 −3.5721E−01 1.0721E−01 −8.8027E−02 4.8995E−01  1.5804E+00 R7  1.0527E+02 −1.6902E+00 3.4654E+00 −1.9859E+01 1.0914E+02 −4.2271E+02 R8 −3.5464E+01 −9.4749E−01 3.1917E+00 −1.2344E+01 3.2852E+01 −5.6724E+01 R9 −9.8637E+02 −3.4687E−01 2.5642E+00 −1.1597E+01 3.2683E+01 −5.8675E+01 R10 −9.0046E+00 −1.2349E−01 6.2495E−02  1.1903E−01 4.4295E−02 −4.8762E−02 R11  4.5978E+00  5.7384E−02 −2.7444E−02  −1.4815E−02 4.4844E−02  3.8187E−02 R12 −6.3341E−01 −1.4168E−01 1.5246E+00 −3.8991E+00 7.3051E+00 −9.2624E+00 R13 −2.5453E+03 −2.3239E−01 3.1154E−01 −1.6476E−01 −2.9806E−01   6.5660E−01 R14 −4.9959E+00 −2.4934E−01 2.1501E−01 −1.6050E−01 8.6766E−02 −3.1989E−02 Conic coefficient Aspherical surface coefficients k A14 A16 A18 A20 R1 −2.0279E+02 −3.8455E−02   4.1389E−03 −8.9059E−05   1.8548E−05 R2  5.8971E−01 4.3442E+00 −1.1103E+00 9.9634E−02 −6.6708E−02 R5  3.0510E+00 −1.2384E+01   1.0351E+01 1.2108E+02 −2.2495E+02 R6  2.8717E+00 2.8885E+00 −3.1890E+00 −3.0531E+01   7.5454E+01 R7  1.0527E+02 1.0993E+03 −1.6852E+03 1.3083E+03 −3.5870E+02 R8 −3.5464E+01 6.8416E+01 −5.6579E+01 2.7887E+01 −5.6250E+00 R9 −9.8637E+02 6.8716E+01 −5.1751E+01 2.2633E+01 −4.2799E+00 R10 −9.0046E+00 −8.1669E−02  −6.1469E−02 −5.5690E−03   7.1319E−02 R11  4.5978E+00 −3.2307E−02  −3.4226E−02 1.6088E−02 −4.9737E−04 R12 −6.3341E−01 7.7315E+00 −4.0206E+00 1.1662E+00 −1.4276E−01 R13 −2.5453E+03 −6.1497E−01   3.1528E−01 −8.4157E−02   9.0921E−03 R14 −4.9959E+00 7.8696E−03 −1.2317E−03 1.1005E−04 −4.2423E−06

Table 12 shows data of free-form surfaces of the camera optical lens 40 according to Embodiment 4 of the present invention.

TABLE 12 Free-form surface coefficients k X⁴Y⁰ X²Y² X⁰Y⁴ X⁶Y⁰ X⁴Y² X²Y⁴ X⁰Y⁶ R3  1.0084E+00 −3.7496E−02 −7.5272E−02 −3.7598E−02  1.9819E−01  5.9005E−01  5.9495E−01  1.9820E−01 R4  2.4838E+01  2.1076E−02  4.4397E−02  2.1263E−02  1.7712E+00  5.3130E+00  5.3218E+00  1.7711E+00 X⁴Y⁶ X²Y⁸ X⁰Y¹⁰ X¹²Y⁰ X¹⁰Y² X⁸Y⁴ X⁶Y⁶ X⁴Y⁸ R3 −2.0872E+00 −1.0430E+00 −2.0931E−01 −2.0787E−01 −1.2462E+00 −3.1207E+00 −4.0787E+00 −3.0881E+00 R4  6.0829E+01  3.0397E+01  6.1012E+00  2.1821E+01  1.3059E+02  3.2516E+02  4.3454E+02  3.2734E+02 X²Y¹² X⁰Y¹⁴ X¹⁶Y⁰ X¹⁴Y² X¹²Y⁴ X¹⁰Y⁶ X⁸Y⁸ X⁶Y¹⁰ R3  1.9829E+00  2.7432E−01  6.1978E−01  4.9811E+00  1.8327E+01  3.5566E+01  4.5057E+01  3.4926E+01 R4 −7.2734E+01 −1.0276E+01 −1.0341E+02 −8.3260E+02 −2.8949E+03 −5.7047E+03 −7.4372E+03 −5.7907E+03 X⁸Y¹⁰ X⁶Y¹² X⁴Y¹⁴ X²Y¹⁶ X⁰Y¹⁸ X²⁰Y⁰ X¹⁸Y² X¹⁶Y⁴ R3 −5.9307E+01 −3.7891E+01 −1.5831E+01 −3.5228E+00 −4.6873E−01 −3.8868E+00 −3.8833E+01 −1.7130E+02 R4 −1.7195E+04 −1.2102E+04 −5.1983E+03 −1.3314E+03 −1.4700E+02  8.5521E+02  8.4946E+03  3.8198E+04 X⁸Y⁰ X⁶Y² X⁴Y⁴ X²Y⁶ X⁰Y⁸ X¹⁰Y⁰ X⁸Y² X⁶Y⁴ R3  2.1566E−01  8.5493E−01  1.2871E+00  8.6457E−01  2.1584E−01 −2.0969E−01 −1.0547E+00 −2.1254E+00 R4 −4.4213E+00 −1.7692E+01 −2.6470E+01 −1.7699E+01 −4.4186E+00  6.0912E+00  3.0402E+01  6.0692E+01 X²Y¹⁰ X⁰Y¹² X¹⁴Y⁰ X¹²Y² X¹⁰Y⁴ X⁸Y⁶ X⁶Y⁸ X⁴Y¹⁰ R3 −1.2297E+00 −2.0754E−01  2.7505E−01  1.9368E+00  6.0014E+00  9.9666E+00  9.8504E+00  5.8422E+00 R4  1.3075E+02  2.1845E+01 −1.0315E+01 −7.3218E+01 −2.2921E+02 −3.7169E+02 −3.6739E+02 −2.1516E+02 X⁴Y¹² X²Y¹⁴ X⁰Y¹⁶ X¹⁸Y⁰ X¹⁶Y² X¹⁴Y⁴ X¹²Y⁶ X¹⁰Y⁸ R3  1.7562E+01  5.1382E+00  6.1498E−01 −4.5089E−01 −4.0249E+00 −1.3913E+01 −3.6531E+01 −6.0083E+01 R4 −2.8787E+03 −8.3079E+02 −1.0343E+02 −1.4659E+02 −1.3406E+03 −5.2576E+03 −1.1588E+04 −1.7133E+04 X¹⁴Y⁶ X¹²Y⁸ X¹⁰Y¹⁰ X⁸Y¹² X⁶Y¹⁴ X⁴Y¹⁶ X²Y¹⁸ X⁰Y²⁰ R3 −4.5337E+02 −8.2879E+02 −9.5539E+02 −8.1944E+02 −4.6645E+02 −1.7349E+02 −3.7329E+01 −3.9440E+00 R4  1.0712E+05  1.9135E+05  2.1394E+05  1.9049E+05  1.0582E+05  3.8771E+04  8.4584E+03  8.5202E+02

FIG. 8 illustrates a case where an RMS spot diameter of the camera optical lens 40 according to Embodiment 4 is in a first quadrant. It can be seen from FIG. 8 that the camera optical lens 40 according to Embodiment 4 can achieve excellent imaging quality.

Table 13 below lists values corresponding to respective conditions in the present embodiment. The camera optical lens according to Embodiment 4 satisfies the respective conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 0.669 mm. A full-field image height of the camera optical lens (along a diagonal direction) is 6.000 mm, an image height along the x direction of the camera optical lens is 4.800 mm, and an image height along the y direction of the camera optical lens is 3.600 mm. In such rectangular range, the best imaging effect can be achieved. A FOV (field of view) along a diagonal direction is 120.43°, a FOV along the x direction is 110.45°, and a FOV along the y direction is 98.99°. Thus, the camera optical lens 40 can satisfy design requirements for ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

TABLE 13 Parameters and Embodi- Embodi- Embodi- Embodi- Conditions ment 1 ment 2 ment 3 ment 4 f1/f −4.43 −3.96 −1.54 −1.36 d1/d2 5.12 6.67 1.52 1.60 f 1.770 1.770 1.291 1.337 f1 −7.837 −7.011 −1.993 −1.811 f2 −10.626 −10.626 4.064 3.696 f3 2.302 2.214 1.900 1.728 f4 −6.318 −6.251 −2.737 −2.501 f5 −191.666 −32.273 3.268 3.075 f6 1.711 1.692 2.122 1.929 f7 −2.863 −2.969 −4.562 −2.883 FNO 1.95 1.95 2.00 2.00 TTL 6.099 5.987 4.955 4.523 FOV 120.00° 120.00° 116.68° 120.43° IH 6.00 6.00 6.00 6.00

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present invention. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the spirit and scope of the present invention. 

What is claimed is:
 1. A camera optical lens, comprising, sequentially from an object side to an image side: a first lens having a negative refractive power; a second lens; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens; a sixth lens having a positive refractive power; and a seventh lens having a negative refractive power, wherein at least one of the first to seventh lenses comprises a free-form surface, and the camera optical lens satisfies following conditions: −5.00≤f1/f≤−1.00; −7.14≤f4/f≤−1.25; 0.29≤(R7+R8)/(R7−R8)≤2.28; 0.02≤d7/TTL≤0.07, and 1.50≤d1/d2<7.00, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; d1 denotes an on-axis thickness of the first lens; d2 denotes an on-axis distance from an image side surface of the first lens to an object side surface of the second lens; f4 denotes a focal length of the fourth lens; R7 denotes a curvature radius of an object side surface of the fourth lens; R8 denotes a curvature radius of an image side surface of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 2. The camera optical lens as described in claim 1, further satisfying a following condition: 0≤R3/R4≤2.00, where R3 denotes a curvature radius of the object side surface of the second lens; and R4 denotes a curvature radius of an image side surface of the second lens.
 3. The camera optical lens as described in claim 1, further satisfying a following condition: −4.00≤f7/f≤−1.50, where f7 denotes a focal length of the seventh lens.
 4. The camera optical lens as described in claim 1, further satisfying following conditions: −5.41≤(R1+R2)/(R1−R2)≤0.55; and 0.03≤d1/TTL≤0.18, where R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of the image side surface of the first lens; and TTL denotes a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 5. The camera optical lens as described in claim 1, further satisfying following conditions: −12.01≤f2/f≤4.72; −4.80≤(R3+R4)/(R3−R4)≤5.83; and 0.03≤d3/TTL≤0.11, where f2 denotes a focal length of the second lens; R3 denotes a curvature radius of the object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 6. The camera optical lens as described in claim 1, further satisfying following conditions: 0.63≤f3/f≤2.21; 0.07≤(R5+R6)/(R5−R6)≤0.24; and 0.06≤d5/TTL≤0.21, where f3 denotes a focal length of the third lens; R5 denotes a curvature radius of an object side surface of the third lens; R6 denotes a curvature radius of an image side surface of the third lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 7. The camera optical lens as described in claim 1, further satisfying following conditions: −216.57≤f5/f≤3.80; −21.08≤(R9+R10)/(R9−R10)≤2.81; and 0.05≤d9/TTL≤0.15, where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object side surface of the fifth lens; R10 denotes a curvature radius of an image side surface of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 8. The camera optical lens as described in claim 1, further satisfying following conditions: 0.48≤f6/f≤2.47; 0.47≤(R11+R12)/(R11−R12)≤2.53; and 0.05≤d11/TTL≤0.17, where f6 denotes a focal length of the sixth lens; R11 denotes a curvature radius of an object side surface of the sixth lens; R12 denotes a curvature radius of an image side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 9. The camera optical lens as described in claim 1, further satisfying following conditions: 0.96≤(R13+R14)/(R13−R14)≤5.19; and 0.03≤d13/TTL≤0.24, where R13 denotes a curvature radius of an object side surface of the seventh lens; R14 denotes a curvature radius of an image side surface of the seventh lens; d13 denotes an on-axis thickness of the seventh lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis. 